11556656603 has 2 divisors, whose sum is σ = 11556656604. Its totient is φ = 11556656602.

The previous prime is 11556656599. The next prime is 11556656663. The reversal of 11556656603 is 30665665511.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11556656603 - 2² = 11556656599 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (11556656663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5778328301 + 5778328302.

It is an arithmetic number, because the mean of its divisors is an integer number (5778328302).

Almost surely, 2^11556656603 is an apocalyptic number.

11556656603 is a deficient number, since it is larger than the sum of its proper divisors (1).

11556656603 is an equidigital number, since it uses as much as digits as its factorization.

11556656603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486000, while the sum is 44.

The spelling of 11556656603 in words is "eleven billion, five hundred fifty-six million, six hundred fifty-six thousand, six hundred three".